/usr/share/doc/libgsmme-dev/README.NLS

0 Introduction
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This version of gsmlib contains national language support (NLS) using
the GNU (or OS-supplied) gettext library. gettext eases the handling
of translations of (usually english) output messages to other
languages by introducing the concept of message catalogs.
Message catalogs can exist in various formats. The human-readable and
-editable format is the PO file format.
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/usr/share/doc/libgsmme-dev/README.developers.gz

OVERVIEW
The GSM library is written in C++ and uses the latest C++
features: namespaces, exceptions, the standard template library.
The actual library source code is in the gsmlib subdirectory of
this distribution. The following modules are available:
gsm_alloca.h OS-specific alloca defines
gsm_at.h Utility classes for AT command sequence handling
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